Basically that the Vegas setting didn't work. The class differences which drive part of the plot were not adequately conveyed in the new setting. He also felt it was too dark. Personally I think it's supposed to be dark, he's going to HELL. I think most productions are not dark enough, but the bluehaired set has less of a tolerance for that sort of thing than us young whippersnappers with our Mtv and Quentin Tarantino.